In other words, 418 cubic yards is 0.000000000079 times the size of an Halley's Comet, and the size of an Halley's Comet is 13,000,000,000 times that amount.

(Comet Halley, officially "1P/Halley") (volume calculated based on 2005 dimensions)
Halley's Comet, the famous comet visible to observers on Earth approximately every 76 years, has a peanut- or potato-shaped nucleus made of rock, dust, ice, and various frozen gasses. The nucleus measures approximately 15 km by 8 km by 8 km, which yields a calculated volume of 5,300,000,000,000 cubic yards. The coma of the Comet — the trail of sublimated gasses that give the Comet its visibility — may be up to 100,000 km in length.

In other words, 418 cubic yards is 0.0000000000766 times the size of The Grand Canyon, and the size of The Grand Canyon is 13,100,000,000 times that amount.

(Coconino County and Mohave Counties, Arizona, near Fredonia and Grand Canyon, Arizona)A dynamic and continuously changing landscape, the Grand Canyon has an approximate volume of 5,450,000,000,000 cubic yards. The strata of the rock visible in the Canyon's walls display nearly 2 billion years of geological history.